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13 February, 00:02

Determine if the two vectors u = - 3i - j and v = 2i + 2j are orthogonal. If they are not orthogonal, specify the angle between them

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  1. 13 February, 01:15
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    Two vectors by definition are orthogonal when the angle between them is 90 degrees.

    It can also be said that they are orthogonal if the scalar product between both vectors is zero.

    We have then:

    u = - 3i - j

    v = 2i + 2j

    u. v = ( - 3i - j) (2i + 2j) = - 6-2

    u. v = - 8

    They are not orthogonal vectors.

    The angle between them is

    lul = root (( - 3) ^ 2 + (-1) ^ 2) = 3.16227766

    lvl = root ((2) ^ 2 + (2) ^ 2) = 2.828427125

    The angle between them is:

    cos (x) = (u. v) / ((lul) * (lvl))

    cos (x) = ( - 8) / ((3.16227766) * (2.828427125))

    cos (x) = - 0.894427191

    x = acos (-0.894427191)

    x = 153.4349488

    x = 153.43

    Answer:

    It is not orthogonal

    Angle between them:

    x = 153.43
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